• [Wiki] https://en.wikipedia.org/wiki/Pyrgulopsis_robusta.
• [fs] https:www.fs.fed.us. factsheet for Pygulopsis robusta.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [LysnKoet2006] Lysne, S. and Koetsier, P. (2006). Growth rate and thermal tolerance of two endangered snake river snails. Western North American Naturalist, 66(2):230--238.